java中当程序只有后台线程时就会结束-优快云博客

博客展示了后台线程的演示代码及运行结果，还对 main 线程是否为主线程、t 线程是否默认是后台线程进行了判断，同时呈现了后台线程运行时的输出信息。

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演示代码

package baidu.com;

class DamonThread implements Runnable {//创建DamonThread类实现Runnable接口
public void run (){                   //实现接口中run的方法
 while (true){
 System.out.println(Thread.currentThread().getName()+"--- is running.");
    }
  }
}
public class awx524{
 public static void main (String[]args){
System.out.println("main 线程是主线程吗？"+Thread.currentThread().isDaemon());
DamonThread dt=new DamonThread();                            //创建一个DamonThread对象 dt
Thread t=new Thread(dt,"后台线程");                          //创建线程t的共享dt的资源
System.out.println("t 线程默认是后台线程吗？"+t.isDaemon());//判断是否为后台线程
t.setDaemon(true);                                         //将线程t设置为后台线程
t.start();                                                //调用start()方法开启线程t
for (int i=0;i<3;i++){
System.out.println(i);
    }
  }
}

运行结果

main 线程是主线程吗？false
t 线程默认是后台线程吗？false
0
1
2
后台线程— is running.
后台线程— is running.
后台线程— is running.
后台线程— is running.
后台线程— is running.
后台线程— is running.
后台线程— is running.
后台线程— is running.
后台线程— is running.
后台线程— is running.
后台线程— is running.
后台线程— is running.
后台线程— is running.
后台线程— is running.